Alarming Based On Service States - Avaya G350 Maintenance Manual

Avaya Communication Manager controlled maintenance
ISDN-TRK (DS1 ISDN Trunk)
On 32 channel interfaces, any of ports 1-15 and 17-31 on the DS1 interface Media Module can be a B-
channel. The 16th port may be used as a B-channel or as a D-channel depending on the type of ISDN-PRI
signaling group (FAS or NFAS) to which it belongs. For more details, refer to ISDN-SGR and "MG-DS1
(DS1 Interface Media Module)" in this chapter.
For interfaces using country protocol 1 on the DS1 Media Module administration form (including US),
the signaling protocol used for the maintenance of the B-channel is defined by the ISDN-PRI
specification. For interfaces using country protocols other than 1, the signaling protocol used for the
maintenance of the B-channel is defined by the CCITT ISDN-PRI Specification.
There are five possible service states for a B-channel. the service state is negotiated with the far-end
switch, changes over time, and may have a far-end and near-end components. The service state is
initialized to out-of-service/Far-End and an attempt is made to negotiate it to in-service.
The ISDN-PRI Specification defines the possible SERVICE STATES for a B-channel. The service state is
negotiated with the far-end switch, changes over time, and may have a far-end or near-end component.
The service state is initialized to the Out-Of-Service/Far-End state and an attempt is made to negotiate it
to In-Service.
NOTE:
The service state of a particular DS1 ISDN Trunk B-channel can be displayed by issuing
the status trunk trunk group/trunk member system technician command.
When a call is present, the specification defines the permissible call states as well. There are tests in the
short and long test sequences for DS1 ISDN Trunk designed to audit these states and ensure agreement
between both ends of the PRI connection.

Alarming Based on Service States

A warning alarm is logged against a DS1 ISDN B-channel trunk when it is placed in the
Maintenance/Far-End or Out-Of-Service/Far-End states, during which the trunk is unusable for outgoing
calls. When a warning alarm is present, use status trunk group#/member# command to determine the
exact state. Other alarms can be diagnosed by using the short and/or long test sequences. Note that an
ISDN B-channel trunk can be placed in a Far-End service state by either action taken by the far-end
switch or by failure of the far-end switch to respond. For example, if the far-end does not respond to a
Remote Layer 3 Query (Test #637 for ISDN-SGR), the associated DS1 ISDN trunk B-channels will be
placed in the Maintenance/Far-End service state.
As a port on a DS1 Media Module (MG-DS1), and as part of a signaling group dependent on a D-channel
(ISDN-LNK) for signaling, operation of the ISDN-TRK is dependent on the health of these other
maintenance objects.
154 Maintenance of the Avaya G350 Media Gateway
June 2004